Re: several quick questions

From: Linus Torvalds <torvalds@osdl.org>
Date: Feb 14, 2006, 19:00 UTC
Message-ID: <Pine.LNX.4.64.0602141056170.3691@g5.osdl.org>
In-Reply-To: <87irrhvkyl.wl%cworth@cworth.org>

On Tue, 14 Feb 2006, Carl Worth wrote:

Show 8 quoted lines

> 
> Oh, I'm blind. I didn't see git-checkout-index, (thanks Kenneth for
> mentioning it elsewhere in the thread). So now I've at least got the
> recipe I was after:
> 
> 	git-read-tree <revision>
> 	git-update-index --replace
> 	git-checkout-index -a -f -u

This is very very inefficient, because it will replace the old index without using the (valid) information that is there from before. Resulting in a lot of unnecessary IO..

You may not care for a small project, but for bigger stuff, you're better off using more subtle approaches.

Explore using "git-read-tree --reset <revision>" or, perhaps even more interesting is "git-read-tree -u -m <oldrev> <newrev>"

> And I think that would make for a dandy command to have in git. Any
> suggestions for a name?

I'd suggest "git reset" as a cool way to say that it "resets" the tree to another version ;)

		Linus